1.2 A compound consists of the ions A3+ and B2-. A possible formula for the compound is …………….. (2)

A travel firm is interested in determining if there is a difference in how customers will receive a new term of service contract based on their age (young, middle aged or senior). A small sample of individuals were asked if they strongly agreed, agreed, disagreed or strongly disagreed with a new term of service contract.  Which cell has the highest contribution to the Chi Square Test Statistic? Age Agreement young strongly agree young agree young agree young disagree young disagree young strongly disagree middle agree middle agree middle disagree middle strongly disagree middle agree middle agree middle agree middle strongly agree middle strongly agree senior agree senior agree senior disagree senior disagree senior disagree

Find the rate of change of average profit given the cost and revenue functions.  After that, find the value of the rate of change of average profit when 9 units are produced. Use three decimal digits. 

All of the following statements about spinal cord pathways and somatosensory receptors are true except:

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1.  For the given distance function, find the following: a. Velocity function b. Acceleration function c. The velocity and acceleration at time t = 1 second.

Find the limits, if they exist. Show all your work for full credit. If you find any vertical/horizontal asymptotes state them clearly. Only algebraic proofs please: Do not use the calculator to enter numbers and find the limit – no credit is awarded for calculator work. You can check your answer with the calculator.   a.

 QUESTION 6    A learner sets up the apparatus as shown in the diagram below:     Right click on the button below to open the image in a new “tab”.          6.1 The decomposition reaction of hydrogen peroxide During this reaction, hydrogen peroxide (H2O2) decomposes into oxygen and water.   6.1.1  What is the purpose of the MnO2 during the above reaction? (1) 6.1.2  Give the balanced equation for this reaction. (3) 6.1.3  Indicate whether the number of molecules is conserved. (2) 6.2 The learner now does a second reaction during which hydrochloric acid (HCl) reacts with zinc.     Right click on the button below to open the image in a new “tab”.          6.2.1 Balance the following equation:   Zn(s)  +  HCl(aq)  →  ZnCl2(aq)  +  H2(g) (2) 6.2.2   The hydrogen that is collected can now react with the oxygen in the air by holding a flame at the mouth of the test tube. Write down a balanced chemical equation for this reaction. (3) 6.2.3 Is the reaction between hydrochloric acid and zinc an example of a physical or chemical change? (1)     [12]  

1.3   Melk wat suur word, word geklassifiseer as… (2)

VRAAG 3 ‘n Onbekende vloeistof word afgekoel vanaf 100oC na -100oC. Beskou die volgende grafiese voorstelling hiervan, en beantwoord dan die vrae wat volg:   Regsklik op die onderstaande blou knoppie om die diagram vir Vraag 3 in ‘n nuwe blad oop te maak.    3.1  Wat gebeur met die stof tussen t=8 minute en t=12minute? (1) 3.2 Is die kinetiese energie van die stof besig om TOE TE NEEM, AF TE NEEM of DIESELFDE TE BLY tussen t=8 minute en t=12 minute? (2) 3.3 Bepaal die smeltpunt van die stof. (2) 3.4 In watter fase is die stof by: 3.4.1 temperatuur van 90oC (1)  3.4.2 temperatuur van – 90oC (1)     [7]